<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>点击停止定时器</button>
    <script>
        //停止定时器
        // window.clearTimeout(timeoutID)
        var btn =document.querySelector('button');
        var timer = setTimeout(function(){
            console.log('爆炸了');
        },5000);
    btn.addEventListener('click',function(){
        clearTimeout(timer);
    })
    </script>
</body>
</html>